| 摘要 |
PROBLEM TO BE SOLVED: To provide a method for recovering and re-utilizing a refrigerant in which oil substances contained in the refrigerant can be completely separated and the recovered refrigerant can be utilized again. SOLUTION: A chlorofluorocarbon to be regenerated and ethanol acting as a solvent are put into a mixing tank 1, pressurized and heated to cause ethanol to be a supercritical state. After ethanol and the chlorofluorocarbon are mixed to each other, their pressure is reduced at a separating tank 3 to a value lower than a critical pressure, their temperature is decreased down to a value lower than an evaporating temperature and a value notless than an evaporating temperature of the chlorofluorocarbon, the oil substance and the chlorofluorocarbon are separated in two layers and then the chlorofluorocarbon in gaseous form is recovered.
|
